Mark Verge makes balloon animals, but his creations aren’t limited to just tiny poodles and flowers like some yellow pages birthday clown. As YouTube’s Coolest Thing channel reveals, he instead builds mammoth creations using nothing but balloons, including a life-size version of a T-rex skeleton.

Measuring in at 12-feet tall and over 43-feet long, the T-rex required some 1,400 balloons and hundreds of hours to construct, and Mark smartly uses a machine to inflate every last one, otherwise he would probably pass out sometime after finishing just the dinosaur’s tiny arms.